Difference between two Vectors

16 次查看（过去 30 天）
connor
connor 2013-11-9
评论： connor 2013-11-11
I have two arrays
A = [-1 1 -2 1 -1 1 -1 -2 -1 1];
B = [-1 1 1 -1 1 -1 -1 1];
and i am wanting to find all of the values in A that do not appear in B.
So the answer would appear that
values = [-2 -2 ] % values that are in A but not B
index = [3 8] % location of 'values' in A
thanks
  1 个评论
connor
connor 2013-11-11
Further to my original question, i now need to find the difference between two vectors of different sizes , but the terms that are new will not be unique ie,
a = [-1 1 2 -2 1 -1 -2 -2 1 -1 -2 2 -1 1]
b = [-1 1 2 -2 1 -1 1 -1 -2 2 -1 1]
hence the difference between these two vectors are the two -2 terms at the centre of a .
The current code will only find new terms that have not appeared before but not the difference in the vectors.
Appreciate any help, thanks.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-11-9
A = [-1 1 -2 1 -1 1 -1 -2 -1 1];
B = [-1 1 1 -1 1 -1 -1 1];
a=setdiff(A,B)
index=find(ismember(A,a))
values=A(index)
  2 个评论
connor
connor 2013-11-11
Further to my original question, i now need to find the difference between two vectors of different sizes , but the terms that are new will not be unique ie,
a = [-1 1 2 -2 1 -1 -2 -2 1 -1 -2 2 -1 1] b = [-1 1 2 -2 1 -1 1 -1 -2 2 -1 1] hence the difference between these two vectors are the two -2 terms at the centre of a .
The current code will only find new terms that have not appeared before but not the difference in the vectors.
Appreciate any help, thanks.

请先登录，再进行评论。

更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2013-11-9
ii = ~ismember(A,B)
values = A(ii)
index = find(ii)

类别

在 Help Center 和 File Exchange 中查找有关 Operators and Elementary Operations 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by